RU2406195C2 - Support unit for mechanical and electrical connection of at least one plug-in tr tube for protection from overvoltage - Google Patents

Abstract

FIELD: electricity. ^ SUBSTANCE: support unit (21) for mechanical and electrical connection of at least one plug-in TR tube (20) includes U-shaped housing with switching device (8) being situated in its bottom (3) to indicate or transmit faulty state. The housing consists of at least one aperture where at least one spring-loaded push-button actuator (1) interacting with a switching device. The push-button actuator, when TR-tube is plugged in, interacts with mechanical contact or with starting element installed into this mechanical contact, and moves inside the coupling link of the bottom. The lower projection (4) directed perpendicularly to push actuator movement, includes raked surface corresponding to reciprocal raked surface of the slider (7), which moves perpendicularly to movement in the bottom (3) in order to transform push actuator movement into perpendicular movement. Consequently, the slider may be moved from the first to the second state to actuate switching device. In addition, the slider may be preliminary loaded with spring element so that raked surfaces connect forced closure. ^ EFFECT: reliable actuation of switching device at small relative movements and reduced costs for plug-in TR tubes manufacture. ^ 11 cl, 11 dwg

Description

Technical field

The invention relates to a support unit for mechanically and electrically connecting at least one plug-in (plug) arrester for surge protection (hereinafter referred to as the arrester), wherein the support unit comprises a U-shaped housing with a base in which a switching device for indicating or for warning is located about the condition of the malfunction, then the housing contains at least one opening, which includes at least one spring-loaded push-button pusher, which interacts with a switching device, Rich button pusher in the inserted arrester is brought into mechanical contact with it or with a trigger element in a surge arrestor according to the preamble of claim 1.

State of the art

From the German utility model DE 202004006227, a spark gap with a transmitting contact for signaling a fault is known. The triggering of potential-free mechanics occurs, according to this document, by means of thermal monitoring of the installed varistors or the trigger device of the used network spark gaps in the corresponding connected units. In this case, the operation is transmitted further by means of pre-tensioned springs using a gate or a flexible plate.

In the reference node of the known device for overvoltage protection, this mechanical movement by means of a control pusher and a rocker arm, supported by rotation, is transferred to a micro switch, which at its outputs gives a potential-free switching contact.

A multi-pole arrester for use in low-voltage power systems is known from DE 10001667 C1, comprising a single substantially U-shaped support assembly with connection terminals in a housing for active conductors of ground potential, and guiding means for removable connection of plug-in connectors are provided in the housing of the support assembly nodes electrically contacted with connecting terminals, with varistor elements or elements of the spark gap.

According to DE 10001667 C1, a recess is provided in the housing of the support unit for connecting a micro switch for indicating communication.

Further, to indicate communication in the housing, a slot is made extending in the longitudinal direction or horizontally, and a through plane switching rocker is located in the slot. The shift beam interacts with the aforementioned microswitch. The housing contains in the area of each inserted protective element a hole extending in the transverse direction or vertically with access to the switching beam. A rocker actuator is inserted into the holes, and a vertically protruding cam enters the corresponding hole in the casing and interacts with a trigger pin, which serves to control the function, in the corresponding protective element. The rocker actuating elements comprise another cam directed towards the rocker arm, and also a pin formed for guiding the screw pressure spring, which rests on the rocker arm.

By means of the rocker arm and rocker actuators, the function of the inserted safety elements can be monitored by a single microswitch, and configuration control is also possible.

A common feature of the above solutions is that they both require a rocker arm, and a microswitch is actuated by turning movement. Due to the existing gaps and tolerance chain, which is formed due to the presence of many elements, the endpoint of the microswitch is difficult to set, and thus there is a risk of erroneous operation. With the necessary rotary movements, in addition to the tolerances, the functionally determined bearing clearance of the rotary axis makes a negative contribution.

Disclosure of invention

It follows from the foregoing that the object of the invention is to provide an improved support assembly for mechanically and electrically connecting at least one plug-in arrester, the support assembly comprising a U-shaped housing with a base and a switching device for indicating and transmitting fault conditions.

According to the objective of the invention, the actuation of the switching device should also be possible with small relative movements, and tolerances that cannot be avoided by simply changing the direction of movement should in no way adversely affect the switching and actuation characteristics. Further, all the necessary control unit of the switching device must be located in the reference node, and thus, the cost of manufacturing plug-in arresters or similar modules can be reduced.

The solution of the problem of the invention occurs in the support node for the mechanical and electrical connection of at least one plug-in arrester for surge protection according to the set of features of claim 1, and the dependent paragraphs represent at least practical options for implementation and development.

The housing of the support node contains at least one opening that serves to connect at least one push-button pusher, pre-stressed by a spring. In this case, the push-button pusher passes through the opening and can with its free end interact with the lower side of the arrester or with the starting element located there.

When the arrester is inserted, the push-button pusher is in mechanical contact with the arrester or with the aforementioned starting element, which, in turn, is connected to or actuated from the thermal disconnecting device (disconnector).

At least one push-button pusher, pre-stressed by a spring, is movably guided in the wings of the base.

The lower protrusion, oriented perpendicular to the direction of movement of the push-button pusher, has a beveled surface that corresponds to the mating surface of the slider.

The slider is arranged to move perpendicularly to the direction of movement of the push rod in the base to convert the movement of the push rod to the movement movement, essentially in the perpendicular direction, so that the slider can be moved from the first position to the second position to actuate the switching device.

Further, the slider is in a prestressed state with the help of a spring element so that the beveled surfaces of the protrusion of the push-button pusher and the slider are connected with a power circuit.

The push-button pusher in the preferred embodiment may comprise two protrusions spaced apart from each other, each of which is provided with a beveled surface, and a pin for guiding the base of the preload spring in the form of a helical pressure spring is located between the protrusions.

At least one elongated, rectangular in cross section pocket is provided for receiving protrusions of a push-button pusher and a slider.

To maximize the use of the available working space or pocket volume, the slider may comprise a bent knee, which has a shaped part, which, in turn, passes into the wedge-shaped cheek to actuate the cam, especially the switching cam of the switching device or microswitch.

The switching device, especially the microswitch, is located in the recess of the above pocket inside the base.

Inside the pocket is a tire oriented parallel to the direction of movement of the slider.

The slider has a corresponding groove, and thus, the slider can be directed to move along the tire.

A spring element may be inserted into the groove of the slider. This spring element is located in the groove region, preferably without the possibility of falling out, and for this there are two fingers or pins located opposite each other, which fix the spring, especially the helical compression spring.

A plurality of beveled surfaces spaced apart from one another can be made on the slider in order to suitably interact with a plurality of corresponding protrusions of the push button pusher. Thus, it is also possible to control multipolar arresters, which are installed in the corresponding reference node.

One or more push-button pushers are pre-spring loaded in the direction of the plug-in arrester or plug-in arrester, moreover, when the arrester is correctly installed, the prestress spring is further strained and the slider, under the action of its spring element, enters its first end position.

When the plug-in arrester is pulled out or when the starting element is activated, the corresponding push-button pusher moves against the direction of insertion using the increased prestressing force of the prestressing spring. Under the influence of the beveled surfaces, the slider enters the second end position, and the spring element of the slider is stressed.

From the point of view of the general design, for the alarm to be triggered in the support assembly proposed by the invention, only two elements are required, preferably made in the form of plastic molded or stamped parts, namely a push-button pusher with at least one first beveled surface and a slider with at least one second, reciprocal beveled surface. If both beveled surfaces are in geometric closure with each other and movement occurs, then it is transferred under the occurring wedge interaction to the second element, of course with the desired change in the direction of movement, namely from the movement of the push-button pusher up and down to the longitudinal movement of the slider. On the slider, by means of its wedge surface, a micro switch or its pusher is actuated in order to transfer the necessary notification functions.

Brief List of Drawings

The invention is explained below in more detail based on an implementation option, as well as using the figures.

They show the following.

Figure 1: axonometric projection of a module containing two inserted arrester, which are located in the reference node, with a partial cut-out, and with a warning device located there.

FIG. 2: a view similar to that of FIG. 1, wherein the front arrester in the drawing is partially removed from the reference assembly and, as a result, the pusher of the warning device is in its upper position, and a malfunction function is indicated.

Figure 3: side view of the surge protection module with a fully inserted surge arrester and proper operation.

FIG. 4: a view similar to that of FIG. 3, but with an activated trigger element and a disconnected pushrod representing a malfunction of an inserted arrester.

FIG. 5: a view similar to that of FIG. 3, but with a partially removed spark gap and a correspondingly activated warning device.

6: a top view of the base of the support unit with the housing cover removed and the slider shown, as well as with the push pushers shown in normal condition, that is, the communication and warning switch is engaged.

Fig.7: a view similar to that of Fig.6, but in the state of the removed alert function, that is, in case of a malfunction or in the absence of an inserted arrester.

Fig. 8: axonometric view of the base with push-button pushers and a slider in the state of the engaged communication and notification switch.

Fig.9: a view similar to that of Fig.8, but in the state of the terminated alert function.

Figure 10: fragment of a design for reporting faults in the activated state of the communication and warning switch.

11: a fragment similar to that of FIG. 10, but in a state of terminated alert function.

The implementation of the invention

An embodiment of a surge arrester, for example a multi-pole surge arrester for use in a grounding system circuit with phase and neutral input terminals on one side, as well as with a ground connection on the opposite side, contains two plug-in surge arresters 20 that are located in the reference node 21. This common reference node 21 due to the corresponding implementation of its lower side 22 can be mounted on a carrier rail (figure 1).

At the reference node is a warning device to recognize or signal the failure state of one or more arresters 20 when one or both of the arresters 20 are inserted incorrectly. The corresponding alert contact is made potential-free with the possibility of electrical contact through the connecting terminal 23.

Further, on the support unit 21, there are known per se conductive terminals 24.

According to the view of FIG. 2, the front plug-in arrester 20 has been removed and, as a result, the push rod 1 is no longer in contact with the bottom side of the plug-in arrester 20 or with the starting element therein. As a result, the altitude of the push button 1 is shifted up and a switching device 8, for example a micro switch, can be activated.

According to the view of FIG. 3, it can be seen from the partial section shown that the push rod 1 is in mechanical contact with the trigger element 25 in the plug-in arrester 20. This trigger element 25 is connected to an unshown thermal disconnecting device (disconnector) located in the plug-in arrestor 20, wherein the trigger 25 changes its position when the thermal disconnect device is activated.

The corresponding malfunction state, that is, the released push button pusher 1, is shown in FIG.

The push rod 1 is likewise released if the arrester 20 is removed from the support assembly 21 (see FIG. 5).

One or more push-button pushers 1, when changing their height position, contribute to a change in the position of the slider 7, and thus, the shaped part 13 with the wedge surface 14 located there will be able to trigger the switching device, i.e. implement the on or off process.

This control function of the switching device 8 is once again illustrated using the axonometric projection of FIGS. 8 and 9.

Fig. 8 shows the state of the actuated switching device 8, that is, in this case, the push buttons 1 are in their lowest position when the springs 10 are energized.

In the state of FIG. 9, the springs 10 are relaxed and the push pushers 1 fall into their upper position. Corresponding beveled surfaces (see FIGS. 10 and 11) contribute to a change in the direction of movement (up and down push buttons) in the movement of the slide 7.

The features of the mechanical structure for changing the direction of movement and for transmitting the movement of the operation are explained by means of figures 10 and 11 as follows.

Button pushers 1 are guided in the wings 2 of the base 3.

The lower protrusion 4, oriented perpendicular to the direction of movement of the push rod 1, contains a beveled surface 5, and in the embodiment shown in the figures there are two protrusions 4 spaced apart from each other, each with a beveled surface 5.

This beveled surface 5 corresponds to the beveled surface 6 of the slider 7. This slider 7 is movably located in the base 3 perpendicular to the direction of movement of the push rod 1 in order to convert the movement of the push rod 1 into a substantially perpendicular movement in accordance with a wedge gear.

Thus, the slider is made with the possibility of transfer from the first position to the second position for the corresponding impact on the switching device 8.

By means of the spring element 9, the slider 7 is pre-stressed, namely in such a way that the beveled surfaces 5 and 6 are connected to a power circuit.

Between the protrusions 4 of the corresponding push pusher 1 is a pin for guiding the connection of the spring 10 of the prestress.

A pocket 11 is provided in the base 3 (see, for example, FIG. 2) for receiving the protrusions 4 of the push rod 1 and the slider 7.

The slider 7 contains an angular elbow 12, which goes into the molded part 13 with the wedge surface 14 located there to actuate the cam 15 of the switching device 8 (see Fig. 11).

The switching device 8 is, as, for example, seen from Figs. 8 and 9, in the recess of the pocket 11 inside the base 3.

Inside the pocket 11 there is, in addition, a tire 16, which runs parallel to the direction of movement of the slider. The slider 7 has a groove 17 corresponding to the tire 16. Thus, the slider its groove directionally leans relative to the tire 16.

In the groove 17 of the slider 7 is a spring element 9, which serves to pre-tension the slider 7.

This spring element 9 is located without the possibility of falling out in the area of the groove 17, and for this there are two opposed fingers 18.

These fingers take one end of the spring element 9, made in the form of a helical pressure spring.

On slider 7, a plurality of chamfered surfaces 6 can be made in order to interact with a plurality of protrusions of the push-button pusher, namely for the purpose of controlling the multi-pole embodiment of the arrester, and in such an embodiment, the plurality of arrester is located in the reference node in the respective sockets.

One or more push-button pushers 1 are pre-loaded with a spring in the direction of the corresponding plug-in arrester, and when the arrester is correctly installed, the prestressed spring 10 is further strained, and the slider 7, under the influence of its spring element 9, enters the first end position.

When the plug-in arrestor 20 is pulled out or when the starting element 25 is activated, the corresponding push-button pusher, using the increased tension force of the pre-tension spring 10, moves against the direction of insertion of the spark gap. Under the influence of the beveled surfaces 5 and 6, the slider 7 enters the second end position, and the spring element 9 is tensioned, which refers to the slider 7.

The kinetic energy of the push button is transmitted through a pair of beveled surfaces to a slider that changes its position inside the pocket, and as a result of this process, the corresponding cam of the corresponding switching device can be actuated.

In general, with the help of the above-described invention, it is also possible to constructively control the multipolar arrester, which are installed in the corresponding reference node, in a structurally simple way. In this case, the device is designed in such a way that both inserted or partially removed arresters can be detected, or a faulty function can be set by means of a starting element located in the arrester.

Claims (11)

1. A support assembly for mechanically and electrically connecting at least one plug-in arrester for surge protection, the support assembly comprising a U-shaped housing with a base in which a switching device for indicating or reporting a fault condition is located, the housing further comprises at least one aperture in which at least one spring-loaded push-button pusher is located, which interacts with a switching device, and the push-button pusher with an inserted spark gap is in mechanical contact with it or with a starting element located in the arrester, characterized in that the spring-loaded push-button pusher (1) is movably guided in the wings (2) of the base (3), with the lower protrusion (4) oriented perpendicular to the direction of movement of the push-button the pusher (1), contains a beveled surface (5), which corresponds to the mating surface (6) of the slider (7), and the slider (7) is movably located in the base (3) perpendicular to the direction of movement of the push button pusher (1), to convert the movement button pusher (1) in the movement movement, performed essentially in the perpendicular direction, and thus, the slider (7) can be moved from the first position to the second position to actuate the switching device (8), and the slider (7 ) is prestressed by a spring element (9) so that the beveled surfaces (5, 6) are connected with a power circuit. 2. The support node according to claim 1, characterized in that the push-button pusher (1) contains two protrusions (4) located at a distance from each other and provided with each beveled surface (5), and a pin for the guide is located between the protrusions (4) basing spring prestressing. 3. The support node according to claim 2, characterized in that a pocket (11) is provided in the base (3) for receiving the protrusions (4) of the push-button pusher (1) and the slider (7). 4. The support node according to one of claims 1 to 3, characterized in that the slider (7) contains an angular elbow (12) with a shaped part (13) that goes into the wedge surface (14) to actuate the cam (15 ) switching device (8). 5. The support node according to claim 3, characterized in that the switching device (8) is located in the recess of the pocket (11) inside the base (3). 6. The support unit according to one of claims 3, 5, characterized in that inside the pocket (11), parallel to the direction of movement of the slider (7), is the tire (16), and the slider (7) has a corresponding groove (17). 7. The support node according to claim 6, characterized in that a spring element (9) is located in the groove (17) of the slider (7). 8. The support node according to claim 7, characterized in that the spring element (9) is placed in the groove region (17) without the possibility of falling out and for this is installed on two opposite finger-like parts (18). 9. The support node according to one of claims 1 to 3, 5, 7 and 8, characterized in that on the slider (7) a plurality of beveled surfaces (6) are made for interacting with a plurality of corresponding protrusions (1, 4) of the push-button pusher. 10. The support node according to claim 2, characterized in that one or more push-button pushers (1) are pre-spring-loaded in the direction of the plug-in arrester, moreover, when the arrester is correctly installed, the prestress spring (10) is further charged and the slider (7) under the influence of its spring element (9) falls into its first end position. 11. Support node according to claim 10, characterized in that when pulling the plug-in arrester (20) or when the starting element (25) is activated, the corresponding push-button pusher (1) using the increased spring force (10) of the prestress moves against the installation direction of the arrester (20), and under the influence of the beveled surfaces (5, 6), the slider (7) falls into the second final position, and the spring element (9) is stressed.

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